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Cote : N-522 Auteurfsl : Ch. LANTUEJOUL Date : Juin 1977 Titre : Grain dependence test in a polycristalline ceramic Résumé : Our problem is to test the dependence between grains, and their first and second neighbours in a polycristalline ceramic. The parameter used is the number of edges of each grain. This paper particularly emphasizes the correction of bias, which are of three orders : first, grain boundaries are skeletonized; second, the grains that have ail their second neighbours within the frame of measurements are selected; third, we develop a statistical method given by Miles to compensate for edge effects in planar sampling. A classical method is then proposed to test the dependence between the corrected histograms. Sommaire : 1 - Introduction 1 1-1 - Preliminaries 2 2 - Method for measurements 3 2-1 - Skeletonization 3 2-2 - Sélection of grains for measurement 4 3 - Measurements 4 3-1 - Material and equipment 4 3-2 - Measurements procédure 5 3-3 - Correction for edge effects 5 4 - Results and interprétation 8 5 - Conclusion 10